noah akpan sunday, Usman S, Alao OJ, Omisakin OO, Olawale AF. Preliminary Investigation on Production of Brown Ink from Gmelina arborea (ROXB) Fruit Extract. IJSBAR. 2014;18(1):297-303. Accessed April 1, 2026. https://www.gssrr.org/JournalOfBasicAndApplied/article/view/2132